1. In the nick of time 紧要关头
They arrived in the nick of time to save us.
2. Let the cat out of the bag 说出秘密
Their engagement was to be a secret but the ring on her finger let the cat out of the bag.
3. Let the chips fall where they may 让某事发生，不管是好是坏
I'm going to just try out for the cheerleading squad and let the chips fall where they may.
4. Lose your marbles 变得疯狂
Mom has really lost her marbles; she's making me practice writing the Enhanced ACT Essay seven times this week!
5. Once in a blue moon 罕见的
In Florida, the temperature drops below freezing only once in a blue moon.
6. Plain as day 显而易见的
It’s plain as day that you’re in love with her, so just admit it.
7. Play second fiddle 居次位
I hate playing second fiddle to my sister; she always does things better than I do!
8. Put your foot in your mouth 说错话
Jessica really put her foot in her mouth when she asked about John’s job right after he lost it.
9. Pull yourself together 冷静下来；振作起来
Pull yourself together, man! Sure, your girlfriend just dumped you and then you got hit by a car, but you can't let those things get you down.
10. Sick and tired 被打扰或困扰
She is sick and tired of her dog chewing up her shoes every day
11. Sleep on it 在做决定前先考虑一会
Don’t tell me whether you’ll move to Texas with me or not today. Sleep on it, and get back to me tomorrow.
12. Snug as a bug in a rug 温暖舒适的；满足的
That baby looks as snug as a bug in a rug cuddled up next to his mother.
注：snug adj.温暖舒适的、小而整洁的 bug n.昆虫/v.打扰 rug n.地毯
13. Step up your game 迎头赶上
Listen, Jen. You'd better step up your game if you want to get all A's in Miss Finch's Physics class. She isn't easy!
14. Stick your nose into something 干涉
Sharon always sticks her nose into everyone else’s business.
15. Straight from the horse's mouth 来自最可靠的消息
Listen to the news straight from the horse’s mouth; we’re all getting bonuses this week!
16. Take it easy 放松
I know you’re not feeling well, so try to take it easy today.
17. Tip of the iceberg 冰山一角
The fact that Carrie is dating a member of the mafia is just the tip of the iceberg; she’s also smuggling contraband into the country.
18. To not see the wood for the trees 一叶障目
She always argues about the silliest things; it’s like she can’t see the wood for the trees.
19. Up a creek without a paddle 处于困境之中
If you don’t have any money to pay for the repairs we just made to your car, I guess you’re up a creek without a paddle because you can’t have your car back.
注：creek n.小溪 paddle n.桨/v.涉水、用桨划船
20. You rock! 你真棒！
Dude. You rock. Thanks for offering to watch my pet iguana all week.
21. 24/7 一天二十四小时；一周七天；一直；持续地
My little sister irritates me 24/7!
22. A short fuse 急性子
Jamie is known for his short fuse; just a few days ago he screamed at his coach for not letting him play.
23. A taste of your own medicine 自己尝尝相同的滋味
After constantly being prank-called, Julian decided to give Juan a taste of his own medicine and ordered twenty-seven pizzas to be delivered to Juan’s house.
24. Butterflies in my stomach 紧张的
Liam had butterflies in his stomach before he went on stage to play the violin.
25. By the skin of your teeth 勉强做成某事
Lester made the dance team by the skin of his teeth; you can tell he hasn't been dancing jazz for very long.
26. Cat got your tongue? 怎么不说话了？
I just saw you kissing my boyfriend. What’s the matter? Cat got your tongue?
27. Crying wolf 假意求救
You have cried wolf so many times that no one believes you when you're really hurt.
28. Cut someone some slack 放某人一马
Hey. Cut me some slack. I was really busy with my frog hunting business last week and forgot to call. I'm sorry!
29. Down for the count 疲劳的；放弃；不能或不愿再参与
No, you can’t take my dog for a walk – she’s down for the count after chasing cats all day.
30. In the fast lane 繁忙刺激的人生
When Curtis turned forty, he decided he needed to live life in the fast lane, so he quit his job as a dentist and decided to tour Europe by motorcycle.
31. Draw the line 停止；判定好坏的分界线
I don't mind helping, but I draw the line at doing everything myself.
32. Easier said than done 知易行难
You want me to come to work at 6:00 AM? Easier said than done!
33. Every cloud has a silver lining 困境中总会发现转机
Even though you just got fired, remember that every cloud has a silver lining – at least you don’t have to work for that grouchy boss anymore!
注：silver n.银/adj.银色的 lining n.衬料/v.排队
34. Finding a needle in a haystack 大海捞针
The movie theater was so crowded that getting a seat was like finding a needle in a haystack.
35. Fish out of water 不得其所，格格不入
Tom felt like a fish out of water at the Star Trek convention his new girlfriend begged him to attend.
36. Get something off your chest
I have to get this off my chest – I copied your answers on the Redesigned SAT. Thanks for the 15th percentile score, by the way.
37. Give it a whirl 尝试做某事
I’ve never gone kite-boarding, but I’m prepared to give it a whirl!
38. Go down in flames 在众人面前失败
The football player's career went down in flames after the media learned he'd been losing on purpose to settle gambling debts.
39. Go the extra mile 加倍努力
My dentist always goes the extra mile, offering free back massages at the end of a stressful tooth extraction.
40. Hang in there 有耐心，坚持下去
I know you're struggling right now in school, but just hang in there. It'll get easier. I promise.